Sewing-machine.



F. W. MERRIGK. SEWING MACHINE. APPLICATION FILED FEB.1'1. 190a.

Patented Jan. 11,1910. 6 8HEE18-BHEET 1.

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SEWING MACHINE. APPLICATION FILED IEB.1'I. 1908.

Patented Jan. 11,1910.

ums-sum 4.

Inventor:

F. W. 'MERRICK.

SEWING MACHINE.

APPLIOATION FILED PEB.17, 190a.

@45 5} n Patented Jan. 11, 1910.

6 SHBETSSHEET 5.

h lllllll mum: lllllllfl oQorneg/ F. W. MERRIGK.

SEWING MAGHINE.

APPLICATION FILED IEB.17. 1908.

I Patented Jan. 11,1910.

50652265533: I f venzdnra ans" cornice.

FRANK W. MERRICK, 035 BOSTON, MASSACHUSETTS, ASSIG-NOR TO UNION LOCKSTITCH COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OF MAINE.

SEWINGI'TYIACHINE.

eraser.

Specification of Iletters Patent.

Patented Jan. 12%,

Application filed February 17, 1908. Serial No. 416,197.

To all whom it may concern:

Be it known that I, FRANK V. Mansion, a citizen of the United States,residing at Boston, in the county of Suffolk and State of Massachusetts,have invented a certain new and useful Improvement in Sewing- Machines,of which the following is a specification, reference being had thereinto the accompanying drawings.

The invention relates to lock-stitch sewing machines of the classemploying rotary looptakers or shuttles, and comprises variousimprovements in part applicable more particularly to hook-needlemachines of such class, although in part designed for application toother machines as,well.

One main object of the invention is to produce ahook-needlc lock-stitchsewing ma chine of simple and practical construction capable of aregular working speed far higher than attainable with machinesheretofore in use. With this object in View, I combine in an organizedmachine a loop taker or shuttle rotated at a uniform rate of speed.and-an awl, a hook-needle, and a takeup device, all three actuated bymeans of uniformly rotating cranks. By the employment of cranks for theactuation of the parts, and the uniform rotation, a machine embodyingthe above combination'is characteristically distinguished from machinesheretofore in use. in which cams and other mechanical devices forproducing irregular or variablespecd motion are employed.

Controlling considerations in designing and constructing a hook-needlewax-thread machine are the fact that the awl and needle alternate inpassing through the work. Also, the fact that a half of the needle-work,2'. 6., taking the loop, etc., is performed at the side of the workopposite that from which the needle enters the work and at which theshuttle or loop-taker operates. Also, the further fact that the hookneedle must withdraw from the work before'the shuttle or looptaker canpass through the loop drawn by the neddle, and the fact that between thewithdrawal of theneedle from the .work and the re-entry of the awl andneedle into the same the action of the shuttle or loop-taker in pickingtheloop' that has been drawn by the hook needle through the work, thepassage of the. shuttle or loop-taitcr through the loop or of the looparound tire shuttle or loop-taker, and the subsequent action of thetake-up in drawing-up the loop and tighten ing the stitch, all must beperformed. the said passage, and the drawing-up and tightening, are notcompleted in time, the thread will be pinched within the hole in whichthe stitch is being completed, by the between-substance being crowdedover by the awl in penetrating the material to make a fresh awl -holeor'bythe needle in entering into the awl-hole, so as to prevent thestitch from being properly pulled up and locked.

The difficulties inherent in the foregoing requirements respectingtime-relations have led inventors and detigners heretofore to cmploycams for the actuation of the awl, needle, and take-up, so as to hold upthe action of each thereof at certain times during the cycle ofmovementsof a machine to give time to g t the shuttle or loop-takerthrough the loop, and to move the same with accelerated speed at othertimes so as to accomplish the required movements within the allottedtime during the cycle of the machine; and have led them also to employvariable-speed motion-transn'iitting mechanism for driving the shuttleor loop-taker with an alternately accelerated and retarded speed.

Ga ns and the like are productive of noise, jar, and friction. They aresubject to wear, with resulting play. They and variablespeed deviceslimit the practical working speed of a machine.

I have discovered that the drawbacks incident to the employment of camsand variable-speed devices can be eliminated and that a loop-taker orshuttle rotated at a uniform rate of speed,'and a hook-needle, an awl,and a takemp, all three operated by means of uniformly-rotating crankscan be operatively combined in an easy-motioned rapidrunning machinewhich operates successfully in practice with a regular speed threefoldgreater than that heretofore feasible.

Itmay here be pointed out that in respect of the proportionate allotmentof time in the cycle of operations there is a material dilierencebetween a dry-thread machinc cmploying an eye-pointed needle incombination with a rotating shuttle, and a waxthread machine employing ahook-needle in tie thelike combination. The conditions and requirementsto be met are quite different iii.

the two types of machines, In a dry-thread machine, the needle operatesfrom the side of the WOIk opposite that at which the shuttie is located,and the latter enters the loop of needle-thread while the needle isprojecting through the Work. Hence the said entrance may occur earlierin the cycle of of the latter through the loop, and for the.

setting of the stitch. In other words, ins dry-thread machine a largerproportion of an entire revolution of the driving shaft is available feethe said passage and for the setting of the stitch, namely, from themoment the loop-taking point or hook oi the shuttle enters the. loop ofneedle-thresd alongside the needle until just before the needle, afterits Withdrawal from the Work, reeiuters the latter in beginning theformation' of the succeeding stitch.

Uthetobjects of the invention are to sup port the rotating shuttle orloop-taker in improved manner; facilitate the complete entrance of theloop-taking point or hook of the shuttle or looptaker into the loop andthe sprcedingof the letter for its passage about the shuttle orlooptaketr; allow any required portion of it turn of the shuttle orloop-taker, up to one-half thereof, to he utilized for the spreadingoperation; cnelole the employment of moving Spreaders, or of fixed'devices, i3oc the above purposes, and for that of preventing the loopfrom losing carried by the rotation of the shuttle or loop-taker inbetween the latter and its hearing or support, to be dispensed with it.desired; and eliminate likelihood of lint or a loose end of threadbeing similarly carried into the raceway so as to becomejammedthercinand choke or clog the machine.

Heretofore, in hook-needle Wax-thread lock stitch machines employing arotary shuttle 0 loo i-taltei, the latter has been mounted Within anexternal hearing, hearing has been foi'med in g'i'roctice with ati'ahsvel's-e opening adjacent to the position of the needle, located inadvance of such. position, to ati'ord opportunity for a loop of threadwhich has been taken from the needle by the loop-taking point or hookofthe shuttle o1 loop-taker to he extended transversely across thethickness the shuttle oi' looptaltcr in being spread tar passage around.the latter. However, this opening has extended only a comparativ .shortdistance circumfere llv of the ewe. .e oiloop-taker,

' or loop-taker to ."shott-le or loop-taker loop by itself to ho'hodimeoe. .Fiez 2. ifihset s one.

t) 7 a when the post Work-ea eesesi because, in order; to afford thelatter, the hearing to the position of the nest e, bearing shouldbeyfcut a tent in fronted. the pUSlt the shuttle or looptaker and intothe ogienii the edges of the la o e it support to duce Wear," Oneserious i. tion with the eiiiployme bearing is the tendency c1 rotatingshuttle or loopor an end of h said bearing, iiiti'i'the termed, so as-tochoke or clog the 41M: the loop-taking point mi. ei'ior of the carrylint. i sit on its leadin ortico. from the needle, in into the said loopich will eiii'esisteuce of the back while the point or terethrough.

Hence, the loop-tak a 1 heel: tends to push the loop right ecewey. it

has been necessary, acc to employ e supplemental device as z enter topend the loop suiiicieiitly to the throat of the shuttle-or loop-ta alsonecesm5 easy toemploy the sprea someotherdetect to prevent the loopbeing C211.- ried into the raceway.

F'Nith the last-recited chic ate in view, also the elimination of the t119 advantages just irecited, the iuvention consists, further, in vthecomhin: with a rota'z'y shuttle or loop-taker, of on internal. hearingtherefor.

1 3y ez'ioos other objects indicated in the course of scription, andother rein; invention are pointed or An enrihodimeht of theinvchtilgn,in

thus for contrived,-' illuw. ings, in which latter- Figure 1 shows isportions of a, loch-stitch, threads rig machihe contain certain eedle,Waxsuch em- 1 in end elect, and parts below the letter, including s methat are not shown in Fig. l for want. o room. Fig. 3, Sheet 2, showsports oi 1 ,5. 1 in front elevation. Fig. 4, Sheet 1, shows the. partsthe needle and a portion of the needle-bar.

Fig.6, Sheet 3, is a front elevation of the shuttle and shuttle-support.Fig. 7 Sheet 3, is a plan thereof. Fig. 3, sheet 3, isa rear elevationthereof. Fig. 9, Sheet 4,-is a front elevation of the shuttle, shownseparately. Fig. 10, Sheet 4, 'isa plan thereof. Fig.11, Sheet 4, is aView in horizontal section in the plane of dotted line 11, 11, of Fig.9. Fig. 12, Sheet 5','shows the shuttle-support in rear elevation. Fig.13, Sheet 5, is aplan of the same as shown in Fig. 12. Fig. 14, Sheetf),is a front elevation of the shuttle-bearing,

detached from its support. Fig. 15, Sheet 5,

is a rear elevation of the mounting for the shuttle-bearing. Fig. 16,Sheet 5, 1s avplan of the said mounting as shown in Fig. 15. Fig. 17,Sheet 6, is an elevation of the shuttle, the internal bearing therefor,and a portion of the bearing-support, showing the needle-loop as justtaken by the loop-taking point or hook of'the shuttle. Figs. 18, 19 and20, Sheet 6, are views similar to Fig. 17

but showing different stages in the passage of the needle-loop aroundthe shuttle. Having reference to the drawings,at 1, Figs. 1 and 2, isshown a portion of the overhanging arm and head of a sewing ma chine; at2, Figs. 2 and 4, is shown a portion of the base of the machine-frame;at 3, Figs. 2, 3 and 4, is shown the post; and at 4-, Figs.-1 to 4, isthe work-support at the top of the post. 7

At 5 is a hook-needle, at 6 (Figs. 1 and 2) a rotating shuttle, at 7(Fig. 3) an 'awl, and at 8 (Fig. l) a take-up. The said needleworkst'from below, and the rotating shuttle is located at the same sideof the work. Both are actuated from the con tinuously' driven, uniformlyrotating, shaft 9, Figs. 2 and 4, which is mounted in the base of themachine. The needle is carriedby the needle-bar 5 (only a portion ofwhich is shown). the said needle-bar being in ractice'suitably supportedand guided in 'ts movements, and being shown as having 0 inectedpivotally therewith one'end of a nk 5 the other end of which isconnected to the crank-pin at 5 carried by the disk 5 fixed upon thesaid shaft, the said crank-pin consequently rotating at a uniform rateof speed. The shuttle is operatively combined with the said shaft, anddriven therefrom at a uniform rate of speed, by means of the teeth 6Figs. 5 to 11, with which the shuttle is furnished, and the gear-train6,6, 6

Figs. 2, 3 and 4, the gear 6 being fixed upon shaft 9, and gears 6", 6,being connected to turn in, 211118011, the gear 6 'being locatedimmediately below the shuttle and meshing :with the teeth of theshuttle, at the lower side of the. latter, and the gear (3 meshing withija'id gear 6. Theawl and take-upbOtH -are operated from the crankpin at10, carried by the disk 11' fixed upon the driving-shaft 12, the latterrotating at a uniform rate of speed and being mounted in the overhangingarm and head of the machine. with the uniformly rotating crank-pin 10 bymeans of a link 13. (only a portion of. which is shown in Figs. 1 and 3)having its upper end connected pivotally with the crank-pin and theother with the awl-bar (not shown) carrying the awl 7 The takeup isoperatively combined with the said crank-pin by means of link 14, Figs.1 and 3,

having one end thereof connected pivotally with the crank-pin and theother end with the said take-up.

At 15, Figs. 1 and 3, is the thread-guide for laying the thread in theopen .eye of the -hook-needle after the latter has been thrust throughthe work, and at 16 is the thread-finger for extending the thread abovethe work. These parts are operatively combined with the driving shaft 12by means ofinstrumentalities which are shown in Figs-1 and 3 but areunnecessary to be described inasmuch as the thread-guide andthread-finger and the said instrumentalities form no part of theinvention itself.

In order to meet the requirements as to time resulting from, rotatingthe shuttle or 100 -taker at a continuous unvarying speed, anemploying-a needle working from the same side of the work as the shuttleor loop- ,taker and actuated by means of a uniformly rotating crank, therelative rate of rotation of the shuttle or loop-taker is doubled bysuitably proportioning the gearing 6, 6, 6", so'that the shuttle orloop-takerimakes two turns for each reciprocation of the needle.

The movements of the needle and shuttle or loop-taker are so correlatedthat one complete turn of the latter takes place between the 'time whenthe needle, in descending. leaves the work, and that at which, inascending, it reenters the work, and in opera tion the shuttle orloop-taker picks by its loop-taking point or hook the loop that has justbeen drawn through the work by the descending needle, and passes thesaid loop completely around itself and releases the loop in season to bedrawn up and the stitch tightened, locked, and set, before the ascendingneedle again enters the work.

- In the rotation of the shuttle or looptaker the loop-taking point orhook thereof intersects the path of the needle by passing over thehooked end of the needle as the latter extends the loop of thread whichhas been drawn thereby through the material being stitched. In orderthat at the opposite The awl is operatively' combined in the rotation ofthe siinttleor loopl i or l'lUOlZ not strike ldei', or needle-bat, thele or loop-taken is con ease ,is slightly the path of the 4;, and 5, sothat a; the loco-taking nfel to one side of fins clears the same.snnt'le or looptakcr extent to interfere With f its teet will l i thesaid loop is up and tightened and the e '0 that this action is and..needl center Well of a tel Kemp lever 8 carries a drafode'v ereconstitute-o lay a draft-roll 82 moving th for: engagement Wllll theupper order to enable a consic Table 2" thread to be taken up by a move1 email t of the take-11p lever,

l shuttle and correspond- L1 to be used for the inter "liout entailingundue treks ojl' tlzev take-up lever to carve the zircon-m; of hreadwhich is rcqnired 01" the passage over the shuttle, an opposingdraiodcvice is employed. The latter herein C(BHSL'iSHiQti by astationary draft-roll 8 that pivoted n n. an arm 8 which in turn P.=.::tionar arm 8", is the swings for the purpose of tl ad, the latteris caz'i'ied l against. the fist-co.

lie bends or "i p--i'8VGl pivoted at open even, and ha'ving a.clampingite ivot, and. an. e) oi? slot ts long i A 59- a o a dj at .Jheend J-Lt 8 15 an o k mounted as of the azlanipi and clamping-block, andthen. through the slot or eye of the long arm o. one clamping-lever,

on its Way to the tlireadguide v In tlietalting-np movement of thetakeup lever, draft-roll. 3 acts agsinlt the thread, carrying it againstand bending ii aronnd tlie stationar" dsaft-i'oll 8 The has by thelatter acts to hold 1e shuttle or until. it is pressed out of the openeeasai back the-long arm of the gyipping-leveri fi causingthe latter toturn on its pivot and clamp the thread against the clampingblock 8Thereby the thread is gripped be tween the taking-up d1 rolls and thesource of supply. The lon of the gripping-lever operates also, thecontinued swinging movement of the take-up levcr, as a moving(lilfPdSVlCQ at the inner sideof the stationary. draftnoll 8", to takeup a portion of thread. I

At 8* and 8 are slack-thread controllers, comprising thin plates whichare applied, respectively, to the take-u lever and to the stationaryarm. By the .t i11g-up movement of take-up lever 8, 2'. the directionfrom left to rig" .t in F5" portion of the dread is caused s veen thesaid plate 8 and. the said and another portion caused to sl. en theplate 8 and the arm 8 the mead being lightly clamped between. the platesand the said lever and arm, respectively, and thereby yieldingly Leld asthe talzen lever makes its retnifn' movement, and time controlled.

The loop-taking point book of the shuttle is desig ed 1 time mainportion 4-1. preferaoiy beinn made as a seppiece, Figs. 6, 7, new, andsecured in place upon the shuttle by means ofscrcws .18, 18, Figs. 7 and10, for convenience in. construction and in 3D "epairs. The said pointor hook is loss at the outer side of the shuttle, and f instance isconstructed with an otlset, ei'al, flange 19, 106 shown nest in Figs 5,6, 17 to 20, extending in'vvai'dly toward the center of the shuttle, andsomewhat separated from the adjacent end-face of the shuttle, the spacebetween the said flange and the end-face be- 105 ing sufiicicnt toaccommodate the hooked end of the needle, as shown in Figxiand allow thepoint or hook to pass over the upper of the needle into 313 10013 drawnby the latter, with the outside the 1-10 needle, Without collision Willthe needle. The acting faces of the loop-13 :ing point or book and. theflange thereof are inclined with respect to the center of rotation, as

in the continued advancing movement'of the said point '01 hook after ithas entered Within the loop held and .being'dnaafn by the needle, gainson the descendingncedlo so. as to extend such loop gradually in'thej L20direction in which the needle is musing,

inoving needle and thereby shed,

At 2G, Figs. '1 and 10, is a throat extending transversely across thepeeiplicry of the 12 shuttle from a somewhat enlarged opening 2i, shownbest in Fig." 10, justjin front of the loop talting' point orhook. Inorder to enable the shuttle to be rotated continuously.

with smoothness and Without rattle by means 130 shown in Figs. 1, 2, 6,.9, an angle which,

surface of the bearing.

of a single 'driver 6 in gear-engagement therewith, the mouth, 2'. 6.external opening of this throat, is located in an interval or space ofnormal width between two of the peripheral teeth 6- of the shuttle. Thesaid teeth are spaced normally and uniformly at and adjacent the throat.In order to afford time for entrance of the loop of needle-thread intothe throat as the shuttle rotates, as well as facilitate such entrance,the narrow mouth is made with an inclination rearward from theloop-taking point or hook, as shown best in Figs. 7 and 10. Toaccommodate this inclination of the said mouth, and avoid cuttingthrough a tooth, the driving teeth 6*- are inclined or helical, asshown, forming a spiral gear. The teeth of driver gear 6* are inclinedor helical to match with those of the shuttle, constituting of it, also,a spiral gear,

To permit the inner side of the loop, in being spread transverselyacross the periphery of the shuttle, toslide readily upon the top of thetooth 6 next succeeding the throat, such top is beveled off for thegreater portion of its length, as at to, Figs. v7, 8, and 10, so as toslope inward from near the loopt-aking point or hook to the other end ofthe tooth. teeth 6 from catching or fraying the said edge of the loop,the said ends are also inchned or beveled off, as shown in Figs. 5, 7,and 10.

At 22 is the bearing for the shuttle, it being provided on the tixedsupport 23 which extends across the outer face or end of the shuttle. Aseparately formed bearing piece is employed in this instance forconvenience in constructing and assembling or disassembling the parts,it being removably attached to the said support by the screws 24, 24,etc. The bearing 22 is shown detached in Fig. let of Sheet 5, .and thebearing-support 23 is shown detached in Figs. 15 and 16 of the samesheet. The bearing and bearingsupport combined are shown separately inFigs. 12 and 13 of such sheet, and are represented in connection withthe shuttle in.

Figs. 1, 2, 5, 6 and 7 and also in Figs 17 to 20.

The bearing 22 constitutes an internal support for the shuttle, whichturns upon its exterior. Thesaid bearing enters a nearly completecircular recess 25 in the outerside of the shuttle, as shown best inFigs. 5 and I 11, and the shuttle-wall surrounding such recess makescontact with the peripheral it Lateral displacement of the shuttlerelative to the bearing is prevented by contact of, the back wall of thesaid recess with the inner lateral face or edge of the bearing, and bycontact of an inwardly'p'rojecting lip or flange 26 on the shuttle withthe outer lateral face or edge of the bearing.

To prevent the inner ends of the See also Figs. 17 to '20 In thisinstance the said lip or flange is a portion of a separate ring which,for convenience in constructing and assembling and disassembling theparts, is fitted upon a peripheral portion of the shuttle-body andremovably secured in place thereon by' screws 27, 27, Figs. 7 and 10,the loop-taking point or hook being attached to the said ring by screws-18, 18, already mentioned. The bearing piece is reduced in diameter atthe side thereof next the support or stand v23, byv rabbet'ing the sameas shown in Figs. 5 and 13, to receive the said lip or flange. It isformed as a partial annulus, and is applied to a corresponding seat 28,Fig. 5,

upon the inner side of the support or-stand. The latter is formed with aslightly projcting central boss 29, Figs. 15 and 16, around which thebearing piece fits, the said boss serving to fix the position of thebearing piece and relieve the attaching screws 24, 24, from strain. Oneend of the bearing is located adjacent the path in which the needleascends and descends, slightly to the rear thereof, andthe break inthecontinuity of the bearing extends thence toward the front and part wayaround. This is best shown in Figs 17 to 20, Sheet 6. As the .loop ofthread which has been drawn tle-throat, as shown in Fig. 18.. In theposition occupied in said figure, the loop is clear of the flangedportion of the point or hook, back of the flange 19. The loop-enga ingportion of the shuttle is here reduced in width so that the bend orbight of the loop occupies a position entirel at the shuttle-;

side of the plane occupie by the bearing. Consequently in the continuedrotation of the shuttle that half of the loop which is next the bearingis permitted by the break of continuity in the bearing to swing inbetween the bearing and the adjacent side of the central portion of theshuttle, as shown clearly in Figs. 19 and 20, and to travel entirelyaround the shuttle, between the shuttle and bearing. The break in thecontinuity of the bearing also permits the loop, after completing itstravel around the shuttie, to be drawn up by the take-up, clear of thebearing and shuttle, and tightened into the stitch.

The tip of the looptaking point or hook of the shuttle is at a greaterradial distance from the center of rotation than the acting portion ofthe bearing. T o obviate the necessity of a deep throat in the shuttle,

'caselof an ester? crowd into 'urhich would decrease the relativediameter and capacity of the thread-holding chamber thereof, the rim atthe inner edge of the bearing is made narrow radially, as shown in igs'.5, 12 and i3. Consequently, a compaintively short movement of the loopinward toward center oi'rotation is sufficient to on y it safely to theinner side, centrany, of he said rim. To permit the outer sidoportion ofthe extended loop to move Without hindrance across the outer face of thecentral por ion of the shuttle, as the loop is around the shuttle, thebearingpiece is cupped-out at the side 22 which. is turned toward thesaid face, as shown in Figs. 12, and i5, and the lateral surfaces of thehearingpiece and of the central portion oi the bearing-supportQ? areseparated he race in question'by a space through W the thread. may morewithouttoucln be ring-piece and bearing support. in one ion, aconsiderable proportion of pressure that is transmitted to the shuttlefrom the driving gear il below the same is directed upward, and, also,as the loop of thread passes around the shuttle it tends to lift telatter. When an external bearo' reway is employed, the liftingtendencies or as the top of the shuttle upward against e internalsurface of the top part or" such nearing or raceway, and act to crowd itinto the opening formed across the raceway for the desire-n andspreading of the loop, with liability to bind and Wear to whichreference has been made. It will be obvious why the extent of the saidopen ing must be kept small as possible, in the '11 hearing or raceway.In the case of my int rnal. bearing, on the other hand, the exterior ofthe lower portion of the said oii ers backing or support P iowerportionoi the shuttle, immeadjacent the place at which the driving pressureapplied. to the periphery of the shuttle for the purpose or" rotatingthe latter, and the lifting tendencies merely operate to press the saidlower portion up- Ward against the under side of thebearing,

at the opposite side of the center from. the opening for the admissionand spreading of the loop. All tendency f the shuttle to the openingduring operation, arm to bind and Wear, is thereby eliminated, and theopening may be made larp'cr than heretofore has been feasible Withoutinjurious results. the opening around to the front farenough to allowthe loop. to be carried on the loop trnmg point or nook in the rotationof the shuttle from the position in Fig. 1?, Without encou tering; an oruction, until the inclined face of the said. point or hook asinc nationoi the chord along which the outer side oi: the loop extends, at theouter This permits me to extend ion, soclosely approximating sensor facor side/oi the shuttle (see Fig. 18), that the natural draft (2'. 6.,tens1on,) the loop will suliice to cause the loop'to slip inward uponthe moving point or hook, fully home into the throat as in Fig. 18, andthereby effectuate the spreading. In this instance, the opening in thebearing is of approxiinately 90 in extent. beginning at a point adjacentthe path in which i aeedle ascends and descends" and console in thedirection of rotation oi the shuttle to the extent just stated.

In a machine in which the shuttle or looptaker is rotated at a uniformrate of speed and in which the awl, needle, and take-up are actuated bymeans of uniformly-rotating cranks, the time-allotment within which theioop must be carriedpast the greatest diameter (or bunch) of the shuttleor looptaker is so brief as to necessitate a short loop-taking point,which involves a short throat. it is necessary to take into account thetime between the moment of the entry of the loop-taking tip or pointinto the loop, and the arrival of the loop at the inner end or bottom ofthe throat. Furthermore, in the machine described herein, wherein theshuttle or loo -taker makes two revolutions .so that in this respect thetendency of the point or hook to carry the loop forward bodily upon it,without slipping;- therethrough, is increased; Hence, the loop tends toremain at the outer periphery of the looptaker or shuttle. It thereforewill be ob 'vious that in order to enable the spreading to be effectedby the natural draft of the loop, it is necessary to permit the loop tobe carried around on the point or hook until it assumes the inclinationof the chord aforesaid. The internal bearing favors the attainment ofthis result, because the open ing for the loop may be extended to allowas much of a revolution of the shuttle or loop-taker as necessary, up toapproximately one-half thereof, to be utilized in spreading the loop,although the full amount is not utilized in the case of the machineherein shown and described. Thereby it is made possible to spread theloop Without the aid of special. devices for the purpose, or ofloopdetents, and Without compressing the operation into a short portionof revolution immediately succeeding the pickin and thereby, also, timeenough may be taken to permit a blunt loop-taking point or hook to doits own Work.

around The spiral gear-drive for the shuttle' or loop-taker, hereindescribed, has a tendency to occasion a lateral pressure of the shuttleor loop-taker, against one radial face of the fixed bearing, hereintheouter edge of the internal bearing. This'insures the rotation of theloop-taking point or hook in a definite plane. Should Wear of the.contacting surend of that diameter.

faces thus pressed together take place to a material extent, adjustmentof the bearing laterally by means-of the threaded studs and nuts at 231,232, Figs. 1, and 2, will enable the point or. book to be brought backinto the requiredrelation with the needle, thereby compensating for thewear.

When an outside bearing or raceway in- 2 rotation than the point atwhich the resisttime due'to the frictional contact with the bearingtakes effect. :With thebearmg 22 employed as an internal support for theshuttle, and the latter turningvuponthe pe-' riphery of the saidbearing, and there being no external raceway closely fitting the'periphery of the shuttle, lint or a loose endof thread carried around bythe periphery of the shuttle as the latter rotates cannot become jammedso as to choke or clog the ma-- chine. No necessity exists for theemploy ment of either fixed or moving devices to hold or push the loopback. v

' A loop-detaining oint by which the loop of needle-thread which hascompleted its passage around the loop-taker or'shnttle-is controlled andprevented from flirting about extension or extremity of the bearingitself,

in being drawn up is shown at 221, provided .upon the'internal bearingat the end of the latter which is a short distance in'the rear of theposition of the needle. Constituting an and servin to support the-looptaker or shuttle in c ose proximity to'the needle,'it occupies thespace, previously, referred to, between the inwardl projecting li or:flange 26 of the shuttle an theiwall of t e body of.

the latter. As the said loop'is'drawn up by the action of theneedle-thread take-up V mechanism during the approach of the looptakingpoint or hook toward the needle, such loop engages with the detainingpoint by which it is held and controlled until the takeup action hasmaterially reduced its size, and is then released, to be drawn up intothe scam.

"the loop-taker or shuttle to the la inthe .work. The said rim is smoothFigs. 5 and 11, the body of the looptaker or shuttleis shown formedwith: a central thread-containing chamber or cavity 6 and providedwithin the said cavity with a tubular post 6 upon which is fitted .abobbin 6* serving in practice as a carrier for v the second orinterlocking thread. The cover 6* for the said thread-containing chamberor cavity is furnished with a. c entral pin 6 which fits withinifh'esaid tubular post. The edge of the. cover approaches close to the rim ofthe thread-containing.

chamber or cavity, there-being a small space between the said edge andrim constituting an annular thread-passage through which the thread mayissue from the chamber' o'rcavity. The opening of the chamber or cavityis located at the side of the shuttle opposite that at which the bearingand bearing support, needle-bar, needle, and loop-taking point or hookare located, in order-that free.

access to the said cavity may be had for the purpose of taking outanempty bobbin, i11- serting a filled one, threading-up, etc. Theinterlocking thread, issuing through the annular thread-passageaforesaidat the side of" the loop-taker or shuttlewhich is .farthest from theneedle-bar and needle, as in Fig. 5, bends around the rim of thechambcr'or cavity, and then passes transversel acrosls stitc1 andcontinuous and constitutes an annular thread-guidingsurface around whichthe interlocking thread renders in passing from the source ofsupply tothe stitch-forming point in the machlne. The required tension of theinterlocking thread is secured by the compression of the same betweenthe edge of the cover and the said rim. 'These are in- .clined orbeveled, as indicated in Figs. 5 and '11, to conform somewhat to thedirection of the thread in passing out'of the thread-con taining chamberor cavity, around the rim and across the top of the loop-taker orshuttle to the stitch-making point.

At .6, Figs. 5 and 11, 1s shown the rim or flange with which the cover6' for the thread-.

containingchamber of the loop-taker or shuttle is provided for thepurpose of preventing loose coils of the thread wound upon the bobbin 6from getting between the said a cover and the adjacent head of thebobbinand tightening, around the bobbin-supporting stud or pm. As previouslystated, the said'rim or flange overhangs and encircles the edge of -thesaid head, so'that coils such as have just been referred to cannot drawin zetween the head and the cover.

The term' floop-taker, as is well-known, is both specific and generic inapplication. It is used herein in both senses; in the claims it isemployed generically.

What is claimedis- Y 1. In a lock-stitch sewing machine, .in

r w 1 L, 1 "3 moi." oi. mien one combination a loop-taker rotated at auniform rate of speed, and an owl, a hookneedle, av take-up, anduniformly rotated cranks by which the three parts last men- 5 tioneclare actuated.

2. In a lock-stitch sewing machine, the combination with. a rotaryloop-taker, of stationary internal bearing constituting the inaineffective support by which it is sepporteol in Working position and uponthe exterior of which it rotates.

3. In a lock-stitch sewing machine, in combination a rotary looptaker, eperipheral-- drive, and a bearing constituting an 1.5 internnlsupportfor the loop-taker and. also constituting the main efiective support forthe letter, which turns upon its exterior.

4. In o lock-stitch sewing in combination a rotary loop talzei 2 0 ei'aldrive therefor, and an int between the loop-taking point taker end thecenter constituting eflective support, by which it support Workingposition, and upon the ex whereoi it rotates.

' 5. In a lock-stitch sewing machine, in combination, a hook-needle, anda rotating loop-taker having its entire petiphei out oi Contact withexternei parts and operative to enter tlie loop drawn by the needle,take from the needle, and go entirely through without assistance otherports.

6. In a loelbstitch sewing machine,- in

v combination, hook-needle, a rotating looptaker provitieti with eloop-taking point 01 hook, and an internal constituting the main effectiL- e support therefor which permits unobstructed fort-weed moven theloop with the point or hook 11.. 4e changing single of the loop nncl po.e

hook, and the tension of the loop, enaoie the spreading of the loop totake piece.

'5. In. a loci: stitch sewing machine, n

, oomhinetion, a rotating loopteker, ancl en.

internal hearing constitntin the main it it ive support for the loo a.51, on the exteenii i'ecesseo.

eiiow the loop to lateral face of the s 8. In a locii-sti combinationwith a i'o'my internal hearing i'tonstitn fective support the r, and,annular Working portion permitting the loop to pass one lateral face ofthe bee-Pi 9. in a locle stitch sewn combination a circular looperipheral drive, and e e a; annulus constituting an in e loop-takeraround W for.

10. In a l combination tale", provide f. point or nook ,W the open eyeof th letter, and permit unobstructed .l the loop the s changing the l'nook, and the or? we point 01 hook to so taker, provideoi W point orhook, which the open eye of 11' letter, and internal be i obstructed ommow-en:v with tile so? or hook angles of we oop-noel the tension of. hec hook to nnsli loop Within the ch -zest,

in testimony Wheieo; A

pyesenee of i1 It

